"Frindle" is about a fifth grade boy named Nick who is always getting in trouble. His teacher is very strict, and makes the class constantly check the dictionary. Nick gets the idea to make up words, and begins calling a pen by a new name, a "frindle." This idea catches on and all the kids begin calling pens "frindles." Nick runs into trouble when the adults want him to stop calling pens "frindles" but the word has caught on, all over the country. The book has a happy ending, with Nick successfully turning "frindle" into a real word that is even published in the dictionary.